//
//  CalculatorBrain.h
//  Calculator
//
//  Created by Hilary Muludiang on 11/28/11.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import <Foundation/Foundation.h>


@interface CalculatorBrain : NSObject {
	double operand;
	NSString *waitingOperation;
	double waitingOperand;
	NSString *decimal;
	NSString *newSign;
	double valueInMemory;
	

}

- (void)setOperand:(double)aDouble;
- (double)performOperation:(NSString *)operation;
- (double)setSign:(double)aDouble;
- (void)resetCalculator;


@end
